BBC v Hearn [1977] ICR 685 is a UK labour law case, concerning collective action and the scope of a "trade dispute" under what is now TULRCA 1992 section 244.
ABS objected to transmission unless the BBC agreed to not broadcast to South Africa.
In the High Court, Pain J held that the proposed action was in contemplation or furtherance of a trade dispute.
Lord Denning MR held that the injunction was to be granted, because it was not strictly a dispute over terms and conditions of work.
If that is the right view, it means that the trade union and its officers are not exempt from the ordinary rule of law – which is that men must honour their contracts, and must not unlawfully interfere with the performance of them.